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(No Modei.)

J. VANNETT.

SEWING MACHINE.

No. 388,324. Patented Aug. 21, 1888.

F1 Z. E l 1 LI7 WITNESSES INVENTOR E3 .dttorney N. PETERS,Imluljthngnp'wr, wahiupw, n. c.

UNITED STATES JASPER VANNETT, OF TIFFIN, OHIO,

PATENT OFFICE.

ASSIGNOR OF ONE-THIRD TO GEORGE S. YINGLING, OF SAME PLACE.

SEWING- T aZZ whom it may concern:

Be it known that I, JAsPER VANNETT, a citizen of the United States,residing at Tiftin, in the county of Seneca and State of Ohio, haveinvented certain new and useful Improvements in Sewinglifachines, ofwhich the following is a specification, reference being had therein tothe accompanying drawings.

This invention relates to certain improvements in that class ofsewing-machines known as oscillatinghook machines, in which anoscillating movement is imparted to the shaft which actuates the hookfrom the revolving needle-bar shaft; and it has for its objects toimpart an accelerated movement to the hook, so as to properly time themovement of said hook with respect to that of the needle and take-upmechanism, as more fully hereinafter specified. These objects 1 attainby the means illustrated in the accompanying drawings, in

which- Figure 1 represents a rear view of a portion of a sewing-machine,showing my improvement, with the parts of the device in the positionthey assume when the hook-actuating shaft is idle. Fig. 2 represents arear View of the same, showing the parts in the position which theyassume when the hook-shaft attains its greatest speed. Fig. 3 representsa similar view showing the position of the parts when the hook-shaft isat its lowest rate of speed. Fig. 4 represents a horizontal sectionalview of a portion of a sewing-machine, taken on the line a a of Fig. 2of the drawings, showing my invention. Fig. 5 is a sectional view takenon the line I) I; of Fig. 2. Fig. (i is a detail perspective view of theslotted head or tumbler.

Referring to the drawings, the letter A indicates the needle-bar shaft,and B a crank at the rear end thereof.

C indicates a pitman pivoted at its upper end to the crankpin 1) and atits lower end to a boss, E, at one end of an oscillating arm, E, workingon a pin or fixed bearing secured to a standard, G, attached to theframe of the machine. \Vithin the boss, and arranged to partially rotatetherein, is a pin, H, having on its outer end a curved slotted head ortumbler, H, which embraces and rides upon a eam- Serial No. 266,064.

MACHINE.

Patent No. 388,324, dated August 21, 1888.

(N0 model.)

flange, I, on the rear surface of a curved arm, K, secured to the rearend of a hook-shaft-, L.

When the parts of the device are in the po sition shown in Fig. 1 of thedrawings during the rotation of the needle-bar shaft, the slotted heador tumbler will ride upon the cam- 5 flange for a slight distancewithout moving the arm; but as it travels in the direction shown by thearrow it gradually moves the curved arm until the parts assume theposition shown in Fig. 2, at which position the arm and the hook-shaftattain their maximum rate ofspeed. The parts then travel to the positionshown in Fig. 3, during which the speed of the arm and hook-shaftgradually diminishes, from which point the speed is again accelerateduntil the parts again assume the position shown in Fig.

2, after which the speed is diminished to zero, when the parts againassume the position shown in Fig. l of the drawings.

My device is designed especially to be used 7c in connection with theinvention for which Letters Patent were granted to me the 16th day ofFebruary, 1886, No. $36,456; but it may be employed with any of theoscillating-hook machines of the description mentioned without departingfrom the spirit of my invention.

In order to provide for the relative adj ustment of needle-bar shaft,the hook-shaft, and the connecting parts, the crank on the needle barshaft and the curved cam-arm on the So hook-shaft may be adj ustablysecured by means of setscrews or otherwise.

Having thus described my inventiomwhat I claim, and desire to secure byLetters Patent, 1s-

1. The combination, with the hook-shaft of a sewing-machine, of a camarm secured to the rear thereof, an oscillating arm working on a fixedbearing, a slotted head or tumbler mounted on a pin working in a boss onsaid arm and riding upon the curved arm or cam, and the pitman pivotedat its lower end upon the said boss and connecting with the crankpin ofthe needle-bar shaft, whereby an accelerated motion is imparted to thehook-shaft, substan- 5 tially as specified.

2. The combination, with the needle-bar shaft and the oscillatinghook-shaft, of the ad justable crank secured to the needle-bar shaft, ofthe crank-shaft and said hook-shaft, subthe adjustable curved camsecured to thehookstantially as specified.

shaft, the oscillating arm secured to a fixed I In testimonywhereofIaffix my signature in bearing on the frame of the machine, itsslotpresence of two Witnesses.

5 ted head riding on the curved cam and the JASPER VANNETT.

conneeting-pitman, whereby the parts may be \Vitnesscs: adjusted to givean accelerated movement to \VM. GALLUP, the h0ok-shaft at the properrelative positions I HARRY TAGGART.

